Anyway.
Game & Watch Meta.
G&W's up smash has invincibility from frame 4 behind his head. This is important.
Pivoting into reverse up smash, or just in general ensuring you're facing back against an opponent gives you a realllllllllly broken tool which only very low hitting moves (some dtilts) get through. I was playing with a Socal player @
Eternal phoenix Fire (Zenas) and he was doing such trickery with Fox (he slides gracefully, and the sweet spot on usmash even hits from behind him, quite spooky) and after having him jab my shield from behind 1-2 as a shield trap, I just IDGAF'd an up smash OoS and then the notion hit me. pivot usmash during a dash or turn around shield (to face backwards) for reliably beating horizontal options as well.
G&W has a move that gives him practical entire body invincibility from frame 4, that can be done out of shield, and has short enough cool down that on shield-hit the move is safe (people get jabbed on most aggression attempts).
I also realised that I forgot you could side-b out of a dash and this hits low to the ground. Oh, when people don't tech dash attacks you can dash side-b for a similar reward at worse (although not as practical without precision) or something that can net you a lot of damage/kill (8 freezes, 6 electrocutes, most weak hits don't send very far at all, maintaining positional advantage).
Also as many people know, there's the whole down throw-> side-b combo which is guaranteed at low enough percent and will kill most above 10-15%.
I had really forgone it for a while although I knew it was real, but the 10-15% kill part wasn't really "there". I opted for nairs at low percent out of dthrow but at very low percent that actually doesn't work (lol), sometimes up smash is the same. But yeah, down throw -> side b into regrab on weaker hits is kinda-real and the reward is worth the attempt.
G&W for cheesy 0-20% hyper danger zone game against everyone, hooray. Unfortunately starting matches with this on a semi-consistent basis and still sometimes losing goes to show the G&W struggle